Well, there is the web interface for read-only. For write-only I suppose there is simply emailing a file to the person who owns the Dropbox. For accidental/mali

Well, there is the web interface for read-only. For write-only I suppose there is simply emailing a file to the person who owns the Dropbox. For accidental/malicious deletes there is version rollback as well as one's personal drive backups. I think in order for sharing to "just work" there must be limits to the way ordinary users can accidentally change settings. For those who absolutely require levels of access there are alternatives, just as there are alternatives for those who require something specific which Dropbox does not provide in every other aspect of file-sharing.